This thread is called Oxymorons because it deals with oxymorons.
What's that you ask? What is an oxymoron?
An oxymoron is a figure of speech that combines contradictory terms.

Here's some more examples:-

open secret
larger half
clearly confused
act naturally
alone together
Hell's Angels
found missing
liquid gas
civil engineer
deafening silence
seriously funny
living dead
Microsoft Works
military intelligence
jumbo shrimp
Advanced BASIC
tragic comedy
unbiased opinion
virtual reality
definite maybe
original copies
pretty ugly
same difference
plastic glasses
almost exactly
constant variable
even odds
minor crisis
extinct life
genuine imitation
exact estimate
only choice
freezer burn
free love
working holiday
rolling stop

Hope that is of assistance -
Rgds
NomoneyLoadsahoney...